A pint of water weighs 1 lb. Dry granulated stuff weighs less per volume, ranging about 13-15 oz per pint, but crab meat is pretty wet so I guess a pint of crab meat weighs close to 15 oz. Heap it up and you have about a pound.

My guess: a full dungeness crab's worth of meat could be as little as a half pint (barely legal) to a full pint for one that's 8 inches across the back. I'll bet this is pretty close to Sled Dog's approximation.